About Us Happ.AI is building AI-powered assistants for business. One of our key directions is voice assistants — intelligent systems that answer calls, solve typical client issues, escalate to humans when needed, and sync with CRMs.
We’re building a highly available telephony layer using FreeSWITCH, integrated with OpenAI GPT models and real-time voice analytics. Who We’re Looking For We’re searching for a VoIP engineer who: * Has deep expertise in FreeSWITCH and is comfortable writing C modules * Understands how to build and scale SIP-based voice infrastructures * Has working knowledge of Python (for APIs, integrations, tooling) * Enjoys working with open-source systems and solving practical engineering problems * Can lead the VoIP direction technically and architecturally
Responsibilities * Develop and optimize our FreeSWITCH-based call infrastructure * Build and maintain high-load, low-latency VoIP systems (SIP, RTP, NAT traversal, etc.) * Write custom FreeSWITCH modules in C * Collaborate closely with backend and AI teams (FastAPI, GPT, Whisper, PostgreSQL) * Automate deployment and call monitoring (e.g., HOMER, RTPengine)
We Offer * A chance to shape a cutting-edge AI voice product from the ground up * Direct impact on tech decisions and product architecture * Collaboration with a fast-moving founding team (no bureaucracy) * Flexible hours and fully remote * Competitive salary + performance-based bonuses
How to Apply If you love working on real-time voice systems, open-source tech, and want to build something meaningful — let’s talk.
